[R] single strip for the same group in dotplot lattice

[Luigi Marongiu]

dear all,
I have a set of data that is subdivided in cluster (run 1/run 2) and in
target (A/B). When plotting, I obtain a panel strip with "run 1" and "run
2" for each "A" and "B" panel, so "run 1" appears twice and so does "run
2". It is possible to merge the strip together so that I will have "run 1"
or "run 2" only once? this will reduce the complexity of the data and allow
more space for more detailed information in the strip.
the data follows,
thank you
L

>>>
cluster <- c(rep("run_1", 6), rep("run_2", 6))
type <- rep(c("blank", "positive", "negative"),2)
target <- c(rep("A", 6), rep("B", 6))
value <- c(0.01, 1.1, 0.5,
           0.02, 1.6, 0.8,
           0.07, 1.4, 0.7,
           0.03, 1.4, 0.4)
my.data <- data.frame(cluster, type, target, value)

library(lattice)
dotplot(
  value ~ type|target + cluster,
  my.data,
  groups = type,
  pch=21,
  main = "Luminex analysis MTb humans",
  xlab = "Target", ylab = "Reading",
  col = c("grey", "green", "red"),
  par.settings = list(strip.background = list(col="paleturquoise")),
  scales = list(alternating = FALSE, x = list(labels = c("", "", ""))),
  key = list(
    space = "top",
    columns = 3,
    text = list(c("Blank", "Negative", "Positive"), col="black"),
    rectangles = list(col=c("grey", "green", "red"))
  )
)

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